udev ... I think

element · 05-26-2004, 02:40 PM

Just installed udev, with kernel 2.6.6 on Debian unstable system, but I get this when booting up, this comes from dmesg:

Code:

cdrom: This disc doesn't have any tracks I recognize!
end_request: I/O error, dev sr0, sector 0
Buffer I/O error on device sr0, logical block 0
udf: registering filesystem
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
UDF-fs DEBUG fs/udf/lowlevel.c:57:udf_get_last_session: XA disk: no, vol_desc_start=0
UDF-fs DEBUG fs/udf/super.c:1552:udf_fill_super: Multi-session=0
UDF-fs DEBUG fs/udf/super.c:540:udf_vrs: Starting at sector 16 (2048 byte sectors)
end_request: I/O error, dev sr0, sector 64
UDF-fs DEBUG fs/udf/super.c:1288:udf_check_valid: Failed to read byte 32768. Assuming open disc. Skipping validity check
end_request: I/O error, dev sr0, sector 4294966692
end_request: I/O error, dev sr0, sector 4294965668
end_request: I/O error, dev sr0, sector 4294965444
end_request: I/O error, dev sr0, sector 4294966684
end_request: I/O error, dev sr0, sector 4294965660
end_request: I/O error, dev sr0, sector 4294965436
end_request: I/O error, dev sr0, sector 4294966092
end_request: I/O error, dev sr0, sector 4294965068
end_request: I/O error, dev sr0, sector 4294964844
end_request: I/O error, dev sr0, sector 4294966084
end_request: I/O error, dev sr0, sector 4294965060
end_request: I/O error, dev sr0, sector 4294964836
end_request: I/O error, dev sr0, sector 3524075256
end_request: I/O error, dev sr0, sector 3524074232
end_request: I/O error, dev sr0, sector 3524074008
end_request: I/O error, dev sr0, sector 3524075248
end_request: I/O error, dev sr0, sector 3524074224
end_request: I/O error, dev sr0, sector 3524074000
end_request: I/O error, dev sr0, sector 3524074656
end_request: I/O error, dev sr0, sector 3524073632
end_request: I/O error, dev sr0, sector 3524073408
end_request: I/O error, dev sr0, sector 3524074648
end_request: I/O error, dev sr0, sector 3524073624
end_request: I/O error, dev sr0, sector 3524073400
end_request: I/O error, dev sr0, sector 1248
end_request: I/O error, dev sr0, sector 1024
UDF-fs DEBUG fs/udf/misc.c:225:udf_read_tagged: block=256, location=256: read failed
UDF-fs DEBUG fs/udf/super.c:1342:udf_load_partition: No Anchor block found
UDF-fs: No partition found (1)
end_request: I/O error, dev sr0, sector 64
isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16

The result is that I can't open my CD-r drive, when I push the button to open the drive, nothing happens. It's a SCSI writer. Anyone know how to solve this?

mritch · 05-27-2004, 12:19 PM

what does you ftsab say? is a udf-filesystem in sr0?

"cdrom: This disc doesn't have any tracks I recognize!" looks more like XFree than bootup.

element · 05-27-2004, 02:03 PM

It's an old SCSI CD-writer. I removed udf from my fstab and everything seems fine now.

I have another question, before udev I had a symlink from /dev/hda to /dev/cdrom. But with udev I can't have this anymore, I can create the symlink, but after a reboot the link is gone.
What's happening and can I fix this somehow?

mritch · 05-27-2004, 03:05 PM

well, i don't know much about udev. is it a new way for automatic management of the /dev entries? i used devfs for a time and keep using it at an old server. but it's obsolet or not maintained anymore. there you had a configfile in which one could say to do symlinks and other things about configuration. as i've told i don't know much about udev.

try the following line in your fstab - since you can't use udf-fs (it's the filesystem used on dvd's) if it's not in there.
/dev/dvd_____/dvd______iso9660,udf___ro,users,noauto,exec____0____0

replace the devices with yours. if you'll mount a medium in /dev/dvd now, first iso9660 (cdrom) and then udf (dvd) is tried.

BTW: you don't erally need the link /dev/hda -> /dev/dvd it's just for cosmetics and every program that uses this link (if there are any) can be configured to use /dev/hda directly.

element · 05-27-2004, 03:32 PM

udev is the replacement for devfs, devfs with kernel 2.6 has become obsolete.
I removed the word udf in my fstab all together and it's fine now.